diff --git a/app/controllers/user_admin_controller.rb b/app/controllers/user_admin_controller.rb
--- a/app/controllers/user_admin_controller.rb
+++ b/app/controllers/user_admin_controller.rb
@@ -184,7 +184,7 @@
 
     operation = params[:operation]
 
-    if operation!='add' and operation!='remove'
+    if not ['add','remove','assign'].include? operation
       flash[:notice] = 'You did not choose the operation to perform.'
       redirect_to :action => 'contest_management' and return
     end
@@ -203,8 +203,10 @@
       if user
         if operation=='add'
           user.contests << contest
+        elsif operation=='remove'
+          user.contests.delete(contest)
         else
-          user.contests.delete(contest)
+          user.contests = [contest]
         end
         note << user.login
       end
diff --git a/app/views/user_admin/contest_management.html.haml b/app/views/user_admin/contest_management.html.haml
--- a/app/views/user_admin/contest_management.html.haml
+++ b/app/views/user_admin/contest_management.html.haml
@@ -6,7 +6,7 @@
   = text_area_tag 'login_list', nil, :rows => 25, :cols => 80
   %br/
   You want to
-  = select(nil,"operation",[['add users to','add'],['remove users from','remove']])
+  = select(nil,"operation",[['assign users to','assign'],['add users to','add'],['remove users from','remove']])
   contest
   = select("contest","id",Contest.all.collect {|c| [c.title, c.id]})
   &nbsp;&nbsp;&nbsp;&nbsp;
diff --git a/public/stylesheets/application.css b/public/stylesheets/application.css
--- a/public/stylesheets/application.css
+++ b/public/stylesheets/application.css
@@ -160,16 +160,17 @@
     padding-left: 20px;
     background: #feeefe; }
 
-div.announcementbox {
+.announcementbox {
   margin: 10px 0px;
   background: #bbddee;
   padding: 1px; }
-  div.announcementbox span.title {
+  .announcementbox span.title {
     font-weight: bold;
     color: #224455;
     padding-left: 10px;
     line-height: 1.6em; }
-div.announcement {
+
+.announcement {
   margin: 2px;
   background: white;
   padding: 1px;
@@ -182,11 +183,11 @@
   font-size: 12px;
   margin: 2px; }
 
-div.pub-info {
+.pub-info {
   text-align: right;
   font-style: italic;
   font-size: 9px; }
-  div.pub-info p {
+  .pub-info p {
     text-align: right;
     font-style: italic;
     font-size: 9px; }
@@ -235,3 +236,7 @@
   margin: 10px 0;
   font-size: 12px;
   line-height: 1.5em; }
+
+h2.contest-title {
+  margin-top: 5px;
+  margin-bottom: 5px; }
diff --git a/public/stylesheets/sass/application.sass b/public/stylesheets/sass/application.sass
--- a/public/stylesheets/sass/application.sass
+++ b/public/stylesheets/sass/application.sass
@@ -194,26 +194,25 @@
       background: #feeefe
 
 
-div
-  &.announcementbox
-    margin: 10px 0px
-    background: #bbddee
-    padding: 1px
+.announcementbox
+  margin: 10px 0px
+  background: #bbddee
+  padding: 1px
 
-    span.title
-      font-weight: bold
-      color: #224455
-      padding-left: 10px
-      line-height: 1.6em
+  span.title
+    font-weight: bold
+    color: #224455
+    padding-left: 10px
+    line-height: 1.6em
 
-  &.announcement
-    margin: 2px
-    background: white
-    padding: 1px
-    padding-left: 10px
-    padding-right: 10px
-    padding-top: 5px
-    padding-bottom: 5px
+.announcement
+  margin: 2px
+  background: white
+  padding: 1px
+  padding-left: 10px
+  padding-right: 10px
+  padding-top: 5px
+  padding-bottom: 5px
 
 
 .announcement p
@@ -221,7 +220,7 @@
   margin: 2px
 
 
-div.pub-info
+.pub-info
   text-align: right
   font-style: italic
   font-size: 9px
@@ -288,3 +287,7 @@
     margin: 10px 0
     font-size: 12px
     line-height: 1.5em
+
+h2.contest-title
+  margin-top: 5px
+  margin-bottom: 5px
\ No newline at end of file